/* Copyright (C) 1999, 2000, 2001, 2002, 2008 Free Software Foundation, Inc. Contributed by David Mosberger-Tang <davidm@hpl.hp.com>. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Note that __sigsetjmp() did NOT flush the register stack. Instead, we do it here since __longjmp() is usually much less frequently invoked than __sigsetjmp(). The only difficulty is that __sigsetjmp() didn't (and wouldn't be able to) save ar.rnat either. This is a problem because if we're not careful, we could end up loading random NaT bits. There are two cases: (i) ar.bsp < ia64_rse_rnat_addr(jmpbuf.ar_bsp) ar.rnat contains the desired bits---preserve ar.rnat across loadrs and write to ar.bspstore (ii) ar.bsp >= ia64_rse_rnat_addr(jmpbuf.ar_bsp) The desired ar.rnat is stored in ia64_rse_rnat_addr(jmpbuf.ar_bsp). Load those bits into ar.rnat after setting ar.bspstore. */ # define pPos p6 /* is rotate count positive? */ # define pNeg p7 /* is rotate count negative? */ /* __longjmp(__jmp_buf buf, int val) */ .text .proc EXT_C(grub_longjmp) FUNCTION(grub_longjmp) alloc r8=ar.pfs,2,1,0,0 mov r27=ar.rsc add r2=0x98,in0 // r2 <- &jmpbuf.orig_jmp_buf_addr ;; ld8 r8=[r2],-16 // r8 <- orig_jmp_buf_addr mov r10=ar.bsp and r11=~0x3,r27 // clear ar.rsc.mode ;; flushrs // flush dirty regs to backing store (must be first in insn grp) ld8 r23=[r2],8 // r23 <- jmpbuf.ar_bsp sub r8=r8,in0 // r8 <- &orig_jmpbuf - &jmpbuf ;; ld8 r25=[r2] // r25 <- jmpbuf.ar_unat extr.u r8=r8,3,6 // r8 <- (&orig_jmpbuf - &jmpbuf)/8 & 0x3f ;; cmp.lt pNeg,pPos=r8,r0 mov r2=in0 ;; (pPos) mov r16=r8 (pNeg) add r16=64,r8 (pPos) sub r17=64,r8 (pNeg) sub r17=r0,r8 ;; mov ar.rsc=r11 // put RSE in enforced lazy mode shr.u r8=r25,r16 add r3=8,in0 // r3 <- &jmpbuf.r1 shl r9=r25,r17 ;; or r25=r8,r9 ;; mov r26=ar.rnat mov ar.unat=r25 // setup ar.unat (NaT bits for r1, r4-r7, and r12) ;; ld8.fill.nta sp=[r2],16 // r12 (sp) ld8.fill.nta gp=[r3],16 // r1 (gp) dep r11=-1,r23,3,6 // r11 <- ia64_rse_rnat_addr(jmpbuf.ar_bsp) ;; ld8.nta r16=[r2],16 // caller's unat ld8.nta r17=[r3],16 // fpsr ;; ld8.fill.nta r4=[r2],16 // r4 ld8.fill.nta r5=[r3],16 // r5 (gp) cmp.geu p8,p0=r10,r11 // p8 <- (ar.bsp >= jmpbuf.ar_bsp) ;; ld8.fill.nta r6=[r2],16 // r6 ld8.fill.nta r7=[r3],16 // r7 ;; mov ar.unat=r16 // restore caller's unat mov ar.fpsr=r17 // restore fpsr ;; ld8.nta r16=[r2],16 // b0 ld8.nta r17=[r3],16 // b1 ;; (p8) ld8 r26=[r11] // r26 <- *ia64_rse_rnat_addr(jmpbuf.ar_bsp) mov ar.bspstore=r23 // restore ar.bspstore ;; ld8.nta r18=[r2],16 // b2 ld8.nta r19=[r3],16 // b3 ;; ld8.nta r20=[r2],16 // b4 ld8.nta r21=[r3],16 // b5 ;; ld8.nta r11=[r2],16 // ar.pfs ld8.nta r22=[r3],56 // ar.lc ;; ld8.nta r24=[r2],32 // pr mov b0=r16 ;; ldf.fill.nta f2=[r2],32 ldf.fill.nta f3=[r3],32 mov b1=r17 ;; ldf.fill.nta f4=[r2],32 ldf.fill.nta f5=[r3],32 mov b2=r18 ;; ldf.fill.nta f16=[r2],32 ldf.fill.nta f17=[r3],32 mov b3=r19 ;; ldf.fill.nta f18=[r2],32 ldf.fill.nta f19=[r3],32 mov b4=r20 ;; ldf.fill.nta f20=[r2],32 ldf.fill.nta f21=[r3],32 mov b5=r21 ;; ldf.fill.nta f22=[r2],32 ldf.fill.nta f23=[r3],32 mov ar.lc=r22 ;; ldf.fill.nta f24=[r2],32 ldf.fill.nta f25=[r3],32 cmp.eq p8,p9=0,in1 ;; ldf.fill.nta f26=[r2],32 ldf.fill.nta f27=[r3],32 mov ar.pfs=r11 ;; ldf.fill.nta f28=[r2],32 ldf.fill.nta f29=[r3],32 ;; ldf.fill.nta f30=[r2] ldf.fill.nta f31=[r3] (p8) mov r8=1 mov ar.rnat=r26 // restore ar.rnat ;; mov ar.rsc=r27 // restore ar.rsc (p9) mov r8=in1 invala // virt. -> phys. regnum mapping may change mov pr=r24,-1 br.ret.dptk.few rp .endp EXT_C(grub_longjmp)